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CWE-782Weakness · CWE-782

CVE-2026-56129

MEDIUM · 5.5 CVSS v3.1 Published 2026-06-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
57/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Generic IO & Memory Access driver for PCs provided by TOSHIBA CORPORATION and Dynabook Inc. exposes its IOCTL with insufficient access control. A logged-in user with no administrative privilege may access physical memory.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A Toshiba/Dynabook Windows kernel driver exposes IOCTL (I/O Control) interfaces that allow any logged-in user, regardless of privilege level, to read physical memory. The driver lacks proper access control checks on these IOCTL handlers, allowing a standard user to perform a privileged operation (physical memory access) that should be restricted to administrators or SYSTEM. This is a privilege boundary violation enabling local information disclosure.

MitigationApply vendor-supplied patches for the Toshiba/Dynabook driver when available. Until patched, restrict physical access to trusted personnel only, as any local user can read arbitrary physical memory contents.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Toshiba/Dynabook hardware
    Run 'systeminfo' or check BIOS/UEFI information to confirm the system is a Toshiba or Dynabook laptop or notebook. Check the manufacturer model information in System Properties or via 'wmic computersystem get manufacturer,model'.
    Affected if The system is a Toshiba or Dynabook device and the vulnerable driver is present and loaded.
  2. Locate the Toshiba kernel driver
    Search for Toshiba/Dynabook kernel drivers in the Windows driver directory (C:\Windows\System32\drivers\) or enumerate loaded drivers using 'driverquery /v' or 'Get-Process' with driver enumeration tools. Look for drivers with 'Toshiba' or 'Dynabook' in the name.
    Affected if A Toshiba or Dynabook kernel driver is present on the system.
  3. Verify driver is loaded and running
    Check if the identified Toshiba driver is currently loaded in memory using 'sc queryex type= driver' or by reviewing the output of 'driverquery /v' for the driver name.
    Affected if The Toshiba/Dynabook driver is actively loaded in the kernel.
  4. Test IOCTL access from unprivileged account
    Use a standard user account (non-admin) and attempt to interact with the driver's IOCTL interfaces. This requires a tool capable of sending IOCTL requests to the driver device (such as specialized diagnostic utilities or custom code). Observe if the IOCTL call succeeds without requiring elevated privileges.
    Affected if A standard user account can successfully send IOCTL requests to the driver and access physical memory without administrative rights.
  5. Review user privilege level
    Run 'whoami /all' or check the current user's group memberships to confirm whether the testing account is a member of the Administrators group or has SeDebugPrivilege. Compare against the driver's expected access requirements.
    Affected if The testing account is a standard user without administrative privileges, yet can access the driver's privileged IOCTL functions.

A user is affected if they are running on a Toshiba or Dynabook system with the vulnerable driver loaded, and a standard (non-admin) user account can successfully read physical memory through the driver's IOCTL interfaces.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor-supplied patches for the Toshiba/Dynabook driver when available. Until patched, restrict physical access to trusted personnel only, as any local user can read arbitrary physical memory contents.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA4.0 h
25.0 hours of engineering $4,380
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-56129 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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